From: Mike Galbraith <efault@gmx.de>
To: vatsa@linux.vnet.ibm.com
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
Dhaval Giani <dhaval@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
Aneesh Kumar KV <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1
Date: Wed, 14 May 2008 16:50:33 +0200 [thread overview]
Message-ID: <1210776633.5781.12.camel@marge.simson.net> (raw)
In-Reply-To: <20080514134414.GA12693@linux.vnet.ibm.com>
On Wed, 2008-05-14 at 19:14 +0530, Srivatsa Vaddagiri wrote:
> On Mon, May 12, 2008 at 11:20:47AM +0200, Peter Zijlstra wrote:
> > It looks like things like find_busiest_group() just think everything is
> > peachy when the imbalance is < 1 task - which with all this grouping
> > stuff is not necessarily true.
>
> fwiw, the following hack seems to help bring down regression to ~5%
> (b/n 2.6.25 and 2.6.26-rc1 with USER_SCHED):
>
> Also in the patch GROUP_SCALE can probably be less than what I used (and
> needs a ifdef GROUP_SCHED) ..
On my little Q6600 with git.today, it made no real difference, whether
NORMALIZED_SLEEPERS was enabled or not. I see roughly 10-15% idle time
w/wo this patch, whereas pre-regression, it's < 2%.
-Mike
next prev parent reply other threads:[~2008-05-14 14:50 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-06 2:06 volanoMark regression with kernel 2.6.26-rc1 Zhang, Yanmin
2008-05-06 5:41 ` Zhang, Yanmin
2008-05-06 11:52 ` Dhaval Giani
2008-05-07 17:33 ` Dhaval Giani
2008-05-08 5:18 ` Zhang, Yanmin
2008-05-08 5:32 ` Dhaval Giani
2008-05-08 5:40 ` Dhaval Giani
2008-05-08 5:53 ` Zhang, Yanmin
2008-05-08 6:04 ` Dhaval Giani
2008-05-08 6:11 ` Srivatsa Vaddagiri
2008-05-09 15:52 ` Srivatsa Vaddagiri
2008-05-09 15:54 ` Srivatsa Vaddagiri
2008-05-12 1:39 ` Zhang, Yanmin
2008-05-12 2:04 ` Dhaval Giani
2008-05-12 2:37 ` Srivatsa Vaddagiri
2008-05-12 3:33 ` Zhang, Yanmin
2008-05-12 4:52 ` Srivatsa Vaddagiri
2008-05-12 5:02 ` Zhang, Yanmin
2008-05-12 5:43 ` Zhang, Yanmin
2008-05-12 9:04 ` Mike Galbraith
2008-05-12 9:20 ` Peter Zijlstra
2008-05-14 9:22 ` Zhang, Yanmin
2008-05-14 13:44 ` Srivatsa Vaddagiri
2008-05-14 14:50 ` Mike Galbraith [this message]
2008-05-14 15:12 ` Peter Zijlstra
2008-05-15 8:20 ` Srivatsa Vaddagiri
2008-05-15 8:41 ` Peter Zijlstra
2008-05-15 17:10 ` Srivatsa Vaddagiri
2008-05-07 7:04 ` Andrew Morton
2008-05-07 9:17 ` Ingo Molnar
2008-05-07 9:33 ` Zhang, Yanmin
2008-05-07 17:34 ` Peter Zijlstra
2008-05-07 18:58 ` Peter Zijlstra
2008-05-08 6:07 ` Zhang, Yanmin
2008-05-08 5:20 ` Zhang, Yanmin
2008-05-08 5:34 ` Dhaval Giani
2008-05-08 6:43 ` Peter Zijlstra
2008-05-07 17:42 ` Dhaval Giani
2008-05-08 5:21 ` Zhang, Yanmin
2008-05-08 5:39 ` Dhaval Giani
2008-05-08 6:03 ` Zhang, Yanmin
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